Nutating disk motor



June 3, 1941.

E. M. KRUEGER NUTATING DISK MOTOR Filed July 10. 1939 INVENTOR. I EM M.Kfu fg ATTORNEYJ Patented June 3, 1941 NUTATIN G DISK MOTOR Emil M.Krueger, Milwaukee, Wis., assignor to Badger Meter ManufacturingCompany, Milwaukee, Wis, a corporation of Wisconsin Application July 10,1939, Serial No. 283,541

11 Claims.

This invention relates to improvements in nutating disk motors.

It is the primary object of the invention to reduce noise and wear in anutating disk motor such as is commonly used to drive the register of awater meter.

The invention further includes for its objectives the provision ofbearing surfaces for the disk thrust roller which are continuous acrossthe two parts of the disk chamber, and are preferably made-oi somemoderately yieldable material such as rubber.

It is my further purpose to provide a bearing insert providing thecontinuous bearing surfaces aforesaid, which insert is so interlockedwith the component parts of the chamber as to make it unnecessary to useany securing means or to involve any additional expense in the assemblyof the device.

In the drawing:

Figure 1 is a view in transverse section through.

the chamber of a motor of the nutating disk type embodying thisinvention, parts of the disk and its bearing ball being shown insection.

Figure 2 is a view showing, in relatively separated positions, thecomponent parts of the chamber and the bearing insert which Iincorporate in accordance with this invention.

Figure 3 is a fragmentary inside elevational view of a portion of thechamber and the bear-, ing insert, the nutating disk being fragmentarilyillustrated in section.

Figure 4 is a fragmentary detail view similar to Figure 2, illustratinga modified embodiment of the invention.

Figure 5 is a fragmentary detail view taken in section on line 5--5 ofFigure 4.

Figures 6 and 7 are fragmentary detail views similar to Figures 4 and 5respectively, and illustrating further modified embodiments of theinvention.

Like parts are identified by the same reference characters throughoutthe several views.

The nutating disk 6 is conventional. It is mounted on the usual centralball 1 with an orbitally movable shaft 8 which delivers from the motorthe motion developed by the disk. A pin 8 inserted radially intotheperiphery of the disk carries the thrust roller [0.

The casing is made, as usual, in two component parts I! and I8, whichare of generally cupshaped form and provided with sockets at I! and Ilto receive the ball 1. In accordance with the usual practice, theperipheral margins of the casing parts l5 and ii are adapted forinterlocking engagement to prevent leakage. A partition l9 carried bythe chamber element l5 engages in a slot 20 in the chamber element l6and is also engaged by the slotted portion of the nutating disk 6 in theusual way. At one side of the partition the chamber parts are notched at2| and 22, respectively, the two notches being complementary to providea port. At the other side of the partition each chamber element isprovided with a port as shown at 23 and In the construction shown inFigures 1, 2 and '3, the-entire side wall of each of the chamberelements I5 and i6 is cut away opposite the partition is to provide inchamber element IS a slot at 26, and to provide an extension of thatslot at 21 into chamber element i6. Adjacent slot 26, recesses 28 and 29are cut into the wall surface of chamber element I5, as best shown inFigure 2.

The insert 30, which is separately illustrated in perspective in Figure2, may be made of any material, as for example metal, plastics, fiber orrubber. It is made to fit into the registering notches 26 and 21 tocompletely close the side wall of the chamber. A bearing surface 3| atits top abuts the top wall of the chamber, and a similar bearing surface32 at its bottom abuts the bottom wall of the chamber. Ears 33 and 34projecting laterally from its sides are 'made to fit the recesses 28 and29 to interlock the insert against displacement outwardly respecting thechamber. Thus, on the assembly of the chamber parts, the insert issecurely locked against either inward, outward or lateral movement andbecomes a unitary part of the assembly. In the inner face of the insert30 is provided a channel 35 of the proper width to receive the thrustroller iii. In the past. the thrust roller ill in nutating disk motorshas operated cludes any wear occasioned by the roller traversing ajoint. Moreover, where the insert 30 is made of relatively yieldingmaterial, such as rubber or even hard rubber, it appears that othersources of wear, noise and inaccuracy are eliminated. It may possibly bethat when the thrust is used at 30. Wear between the pin 9 and themutating disk 6 is virtually eliminated by this arrangement.

In the embodiment of the invention shown in Figs. 4 and 5 I do notcompletely cut away the wall of the disk chamber but provide in thecomponent parts thereof dove-tailed grooves at Si and 38 which registerto receive the insert 40. This insert has a wedge-shaped cross sectioncomplementary to the grooves 31 and 38, and constitutes a tenon, wherebyit is positively positioned with respect to each component part of thechamber. This insert is made of rubber or the like, in order that it maybe sufiiciently flexible so that the relatively rigid chamber parts l5and [6 may be assembled upon it. Its slot 35 is identical with thatwhich has already been described, and it functions in the same manner.

In this instance, however, it is positioned wholly within the chamber,and the chamber wall is continuous and unbroken about the exterior ofthe insert. Y

The grooves 310 and 380 in the preferred construction shown in Figs 6and 7 are not dovetailed but have parallel sides. The ends of thecomplementary insert 400 are beveled to a plane which is substantiallyat right angles to the plane in which the casing parts I! and it areattached. Consequently this insert, while firmly interlocked at its endsto be rigidly positioned in the chamber, need not be made of flexiblematerial but may be made of harder rubber, or fiber, or plastic, or evenof metal. In this construction also, the chamber wall is continuous andunbroken about the exterior of the insert and the slot at 35 iscontinuous across the joint between the component parts of the chamberand the insert is positively located in the chamber.

' This application is a continuation in part of my application SerialNo. 243,210, filed Novem ber 30, 1938.

I claim:

1. In a device of the character described, the combination with achamber having upper and lower parts with registering side walls havingregistering portions relieved to receive an insert, an insert havinginterlocking connection with the respective side wall portions of saidparts, whereby to span said parts and be secured against displacementwith respect thereto when said parts and insert are assembled, anutating disk provided with means mounting it operatively in saidchamber, and a thrust roller mounted peripherally on said disk, saidinsert being provided with spaced surfaces with which said roller isengageable, said surfaces being continuous throughout the range ofmovement of the roller in the nutation of said disk.

2. A device of the character described, comprising the combination witha nutating disk provided peripherally with a thrust roller, of a chambercomprising separable upper and lower parts having means for theoperative bearing of said disk, corresponding wall portions of saidparts being relieved to receive an insert opposite the thrust roller ofsaid disk, means for sealing contiguous peripheral margins of saidchamber parts, and a slotted insert provided withspaced bearing surfacesfor said thrust roller continuous throughout the range ofmovementthereof in the nutation of said disk, saidinsert comprising anon-metallic element receivable into the relieved portion of each ofsaid parts in a direction peripherally from its peripheral marginaforesaid. said insert being interlocked with said parts against radialand transverse displacement.

3. In a device of the character described, the combination with anutating disk provided peripherally with a thrust roller, of a chambertherefor having means for the operative mounting of said disk andcomprising upper and lower parts having wall portions peripherallyfitted to said disk and relieved to provide channels extending upwardlyand downwardly in the respective parts opposite said thrust roller, andan insert having an interior surface conforming to the interior surfaceof said chamber, said insert being slidable upwardly into the channel ofthe upper part of said chamber, slidable downwardly into the channel ofthe lower part of said chamber, and provided with means interlocking itwith both parts of said chamber against displacement respecting saidchannels, said insert being provided with means constituting spacedbearing surfaces for said thrust roller, continuous and unbrokenthroughout the range of movement of said roller across both of the partsof said chamher.

4. A device of the character described, com prising a chamber for anutating disk having up per and lower parts, said parts having in theirinterior surfaces registering recesses, in combination with an arcuatelyformed insert internally registering with the walls of said parts andfitted into the respective recesses, said insert having a channelextending upwardly and downwardly to provide spaced bearing surfacescontinuous across the respective parts of said chamber.

5. In a device of the character described, the combination with aflexible insert having an arcuate form vertically and a wedge-shapedform in cross section, said insert being provided with a slotted concaveface, of a meter chamber comprising separable parts, each provided witha dove-tailed slot in which the respective ends of said insert arefitted.

6. In a device of the character described, the combination with upperand lower disk chamber parts provided in registering wall portions withregistering mortises, said wall portions being continuous and unbrokenabout said mortise, of a flexible insert having an inner face coincidingwith the inner faces of the respective parts, said insert being fittedto the respective mortise against transverse displacement, and beingpro- 1 vided with a bearing slot in its inner face having combination ofupper and lower chamber parts having corresponding recessed wallportions, and a rubber insert fitted to said recessed wall portions andprovided with means securing it against displacement respecting theassembled parts, said mucosa iparts, said chamber parts bein: closedabout the insert.

9. In a device of the character described, the combination of upper andlower chamber parts having top and bottom suriacesand correspondingrecessed wall portions, the respective recemes extending into said wallsurfaceaand an. insert fitted to said recessed. wall portions andinterlocked at its ends with the extensions of said recesses into saidwail surfaces. whereby said insert is fixed againstdisptacementrespecting said chamber arts. said insert having its innerwe provided with a slot-and bearing surfaces bounding said slot whichare continuous across the Joint between the respective chamber parts.

10. A fluid meter ccmprisins a meter chamber.

a disk in said chamber Journalied for mutating motion therein, a slotformed in the wall oi the meter chamber and extending only part way intosaid wall. a lining of wear resisting material protecting both sides ofsaid slot, and a thrust roller journalled on said disk and extendinginto said slot.

11. A iiuid meter comprising a meter chamber, a disk in said chamberJournalied for nutating motion therein, a slot in the wail of the meterchamber providing a wail of reduced thickness and having its ends outbeyond the chamber top tending into said slot. 7

, EMIL M. EUEGER.

